/* ThreadedElement.java v 1.0.9   11/6/04 7:15 PM
 *
 * BioEra - visual designer for biofeedback (http://www.bioera.net)
 *
 * Copyright (c) 2003-2004 Jarek Foltynski (http://www.foltynski.info)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

package bioera.threaded;

import java.lang.*;
import bioera.processing.*;

/**
 * Creation date: (2/25/2004 10:53:54 AM)
 * @author: Jarek Foltynski
 */
public abstract class ThreadedElement extends SingleElement implements Runnable {
	protected Thread thread = null;
	protected boolean shutdown = false;
public ThreadedElement() {
	super();
}
public void process() throws Exception {
	// This method should process data in local buffer and sent them to outputs
	throw new RuntimeException("Method process() not implemented in threaded ELEMENT");	
}
public void run() {
	// This method should feed local buffer only
	
	throw new RuntimeException("Method run() not implemented in threaded ELEMENT");
}
public void setThreaded(boolean yes) {
	if (yes) {
		shutdown = false;
		if (thread == null)
			thread = new Thread(this);
	} else {
		shutdown = true;
		if (thread != null) {
			thread.interrupt();
		}
		thread = null;
	}
}
public void start() {
	if (thread != null)
		stop();

	shutdown = false;
	thread = new Thread(this);
	thread.setDaemon(true);
	thread.start();	
}
public void stop() {
	if (thread != null) {
		shutdown = true;
		thread.interrupt();
		// Wait until thread ends.
		int n = 10;
		while (thread.isAlive() && n-- > 0) {
			try {
				Thread.sleep(100);
			} catch (Exception e) {
			}
		}
		thread  = null;
	}
}
}
